Influence of electromagnetic interference on implanted cardiac arrhythmia devices in and around a magnetically levitated linear motor car |
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Authors: | Motoyuki Fukuta MD Noboru Mizutani MD Katsuhisa Waseda MD |
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Institution: | (1) Division of Cardiology, Department of Medicine, Aichi Medical University School of Medicine, 21 Karimata, Yazako, Nagakute-cho, Aichi 480-1195, Japan |
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Abstract: | This study was designed to determine the susceptibility of implanted cardiac arrhythmia devices to electromagnetic interference
in and around a magnetically levitated linear motor car High-Speed Surface Transport (HSST)]. During the study, cardiac devices
were connected to a phantom model that had similar characteristics to the human body. Three pacemakers from three manufacturers
and one implantable cardioverter–defibrillator (ICD) were evaluated in and around the magnetically levitated vehicle. The
system is based on a normal conductive system levitated by the attractive force of magnets and propelled by a linear induction
motor without wheels. The magnetic field strength at 40 cm from the vehicle in the nonlevitating state was 0.12 mT and that
during levitation was 0.20 mT. The magnetic and electric field strengths on a seat close to the variable voltage/variable
frequency inverter while the vehicle was moving and at rest were 0.13 mT, 2.95 V/m and 0.04 mT, 0.36 V/m, respectively. Data
recorded on a seat close to the reactor while the vehicle was moving and at rest were 0.09 mT, 2.45 V/m and 0.05 mT, 1.46 V/m,
respectively. Measured magnetic and electric field strengths both inside and outside the linear motor car were too low to
result in device inactivation. No sensing, pacing, or arrhythmic interactions were noted with any pacemaker or ICD programmed
in either bipolar and unipolar configurations. In conclusion, our data suggest that a permanent programming change or a device
failure is unlikely to occur and that the linear motor car system is probably safe for patients with one of the four implanted
cardiac arrhythmia devices used in this study under the conditions tested. |
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Keywords: | Pacemaker Implantable cardioverter– defibrillator (ICD) Electromagnetic interference Linear motor car |
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